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|Manufacturer||BMW, Bayerische Motoren Werke AG|
The BMW N55 is a turbocharged direct injection straight-6 DOHC piston engine which has been in production since 2009, being initially launched in the BMW 535i Gran Turismo (F07). The N55 generally replaced the N54 in most applications, though high-output versions of the N54 remained in production until the release of the N55HP in 2011 for 2012 models.
While its N54 predecessor uses parallel twin-turbochargers, the N55 uses a single twin scroll turbocharger. BMW has used the term "TwinPower Turbo" to describe both twin-turbo and (single turbocharger) twin-scroll and systems.
The exhaust manifold design, called Cylinder-bank Comprehensive Manifold (CCM) by BMW, aims to reduce the pressure fluctuations to reduce throttle lag and exhaust back-pressure. The N55 also adds Valvetronic variable valve lift, a feature missing in the N54.
The N54's gasoline direct injection system uses piezo injectors, also used in the naturally-aspirated N53 (mostly European markets only), the N55's direct injection uses Bosch solenoid-type injectors. The piezo injectors were more expensive and BMW decided they were not worthwhile in North America, in contrast to Europe which they could perform lean burn to reach their full potential.
The N55 is mated to ZF's 8-speed automatic transmission in most applications such as the 2011 535i and 2013 BMW 740i, and a 6-speed manual is usually available for sedans (excluding the 7-Series), but not crossover the X3, X5 and X6. The N55 engines in the 2011 BMW 135i and 2013 BMW 135is are mated to Getrag 7-speed Dual-clutch transmission or a 6-speed manual transmission.
|N55||2,979 cc (182 cu in)||225 kW (302 hp) @ 5800||400 N·m (300 lb·ft) @ 1200-5000||7000 rpm||84.0||89.6||10.2:1||2009|
|N55HP||2,979 cc (182 cu in)||235 kW (315 hp) @ 5800||450 N·m (330 lb·ft) @ 1200-5000||7000 rpm||84.0||89.6||10.2:1||2010|
N55 (225 kW) 
- 2010-current E92 335i Coupé (2011 model year)
- 2010-2011 E90 335i Sedan (2011 model year)
- 2009-current F07 535i GT (2010 model year)
- 2010-current E82 135i
- 2010-current E70 X5 xDrive 35i
- 2010-current F25 X3 xDrive35i
- 2010-current F10 535i (2011 model year)
- 2012-present BMW F30 335i Sedan (2012 model year)
- 2012-present E71 X6 xDrive 35i (2013 model year)
N55HP (235 kW) 
- 2011-current F12 640i Coupé, Cabriolet (2012 model year)
- 2012-current F12 640i Gran Coupé (2013 model year)
- 2012-current F21 M135i
- 2012-current F01 740i/Li Sedan (2013 model year)
- 2012-current US-Spec E82/E88 135is Coupe/Convertible (2013 model year)
See also 
- Tan, Paul. "The New BMW 5-Series Gran Turismo". Paultan.org. Retrieved 2011-09-23.
- "2011 BMW 740 Reviews, Expert Car Reviews on AOL Autos". Autos.aol.com. Retrieved 2012-10-06.
- Sousanis, John (2011-08-01). "BMW's Newest I-6 Better, Not Bigger | News & Analysis content from". WardsAuto. Retrieved 2012-10-06.
- "2011 BMW 335i Sedan - First Drive Review - Auto Reviews". Car and Driver. Retrieved 2011-09-23.
- by Ryan ZumMallen. "Pop The Hood: Inside the Innovative N55 Engine in the BMW 335i". Automedia.com. Retrieved 2012-10-06.
- "BMW unveils single turbo N55 six-cylinder engine for new 5-series GT". Motorauthority.com. 2009-05-26. Retrieved 2012-10-06.
- "Archive » Exclusive: The NEW ///M Motor in Depth". BimmerFile. 2009-05-23. Retrieved 2012-10-06.
- "Six-Cylinder Midsize Luxury Sedan Comparison - Audi A6, BMW 535i, Lexus GS 350, Infiniti M37". Motor Trend. Retrieved 2012-10-06.
- "World Premiere: 2013 BMW 135is Coupe and Convertible 320 HP From $44,145". Bmwblog.com. 2012-05-15. Retrieved 2012-10-06.
- You must be logged in to post (2010-06-08). "2011 BMW 135i DCT - BMW Luxury Coupe Review - Automobile Magazine". Automobilemag.com. Retrieved 2012-10-06.
- "BMW Heaven Specification Database | Engine specifications for N55 engines". Bmwheaven.com. Retrieved 2012-10-06.
- You must be logged in to post (2010-09-10). "BMW 335i and 335is - Dyno Test - Automobile Magazine". Automobilemag.com. Retrieved 2012-10-06.
- "Six-Cylinder 2012 BMW 640i Coupe Priced from $74,475, Convertible from $81,975". Blog.caranddriver.com. 2011-09-21. Retrieved 2012-04-23.
- By Matt Davis RSS feed. "2012 BMW M135i". Autoblog.com. Retrieved 2012-10-06.
- "BMW’s M135i is much better than it looks". AUSmotive.com. Retrieved 2012-10-06.
- By BMW North America. "BMW 135is Coupe - Model Overview - BMW North America". bmwusa.com. Retrieved 2012-10-06.
- http://www.bmwblog.com/2010/09/12/dyno-test-bmw-335i-and-335is-n54-vs-n55-engine/ comparison of N54 and N55 dyno results
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|4-cylinder petrol||<< M10||M40||M43||N42||N43 / N45 / N46 >>|
|6-cylinder petrol||<< M20||M50||M52||M54 / M56||N52||N53 >>|
|S50 / S52||S54|
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|8-cylinder petrol||M60||M62||N62||N63 >>|
|12-cylinder petrol||M70||M73||N73||N74 >>|